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OCC Lathrop Site Soil and Groundwater Samplin, ork Plan April 28, 2000 3.5 UTILITY LOCATION A private utility locator will be contracted to clear the proposed location of the soil boring with respect to underground utilities. In addition, TSG will consult with Simplot personnel to assess potential obstructions or buried services associated with ongoing facility operations. TSG will require the drilling contractor to clear the borehole location with a hand auger and/or probe to approximately 5 feet bgs prior to starting mechanical drilling operations if the utility locator contractor or onsite personnel cannot provide clearance. 3.6 SITE HEALTH AND SAFETY All work described in the Work Plan will be conducted in compliance with the approved Health and Safety Plan for the Site. 3.7 INVESTIGATION DERIVED WASTE All investigation-derived waste (IDW) will be managed in accordance with applicable regulations. For the purposes of this Work Plan the term IDW refers to residual materials generated during installation of the soil boring and Waterloo Systems or during collection of soil and groundwater samples. Potential sources of IDW include: • Drilling Wastes - Soil cuttings and associated drilling wastes will be staged onsite pending final disposition. IDW will be sampled (composite) and analyzed for characterization. • Purge Water and Decontamination Water— In accordance with the existing agreement between OCC and the Regional Board, purge water and equipment decontamination will be discharged directly to the ground in the area adjacent to the proposed borehole. • Personal Protective Equipment — All PPE including gloves, respirator cartridges, or Tyvek will be drummed and staged onsite pending disposal. 4.0 REPORTING At the completion of field activities and receipt of laboratory analysis, a comprehensive Remedial Investigation Report will be prepared and submitted. At the minimum, the report will contain the following: • Description of all work performed; • Maps showing the site and the location of the and groundwater sampling activities; • Drilling log; • Tables summarizing laboratory results from soil and groundwater samples; • Laboratory analytical reports and chain-of-custody documents; • Conclusions and Recommendations for additional work, as appropriate. 4 The Source Group,Inc.